#34641: Null value referenced from a JSONField using an expression that defines
an
output_field returns the string "null" instead of a None value
-------------------------------------------+------------------------
Reporter: Daniel Schaffer | Owner: nobody
Type: Bug | Status: new
Component: Uncategorized | Version: 3.2
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------------+------------------------
Example of breaking code:
{{{
class ThisHasAJSONField(Model):
data = JSONField(null=True, blank=True, default=dict)
ThisHasAJSONField.objects.create(data=dict(test=None))
qs = ThisHasAJSONField.objects.annotate(
test=Case(
When(id__isnull=True, then=F("data__test")),
default=F("data__test"),
output_field=IntegerField(null=True),
)
)
}}}
When referencing a null value using a JSON lookup from an expression that
defines an `output_field`, the null value is converted to the string
"null" instead of being treated as a `None` value. If the `output_field`
is one that requires some sort of value conversion like `IntegerField`, it
will raise a `ValueError`
See repro repo:
https://github.com/DanielSchaffer/django_json_null_expression_repro
--
Ticket URL: <https://code.djangoproject.com/ticket/34641>
Django <https://code.djangoproject.com/>
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